tidy up some extern declarations

pass lint.

Add bsd_signal as required by POSIX (from GSoC 2016, Charles Cui)

Update old-style definitions to ANSI, remove a couple of register
definitions along the way. Fixed gcc 4.1 build (thank you vax)

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22280, verified by myself.

Delint.
Remove trailing ; from uses of __weak_alias(). The macro inserts this if
needed.

Need an internal name for signal().

If port provides __weak_alias(), provide an Standard C and POSIX pure
identifier namespace by renaming non standard functions and variables
such that they have a leading underscore. The library will

If port provides __weak_alias(), provide an Standard C and POSIX pure
identifier namespace by renaming non standard functions and variables
such that they have a leading underscore. The library will use those
names internally. Weak aliases are used to provide the original names
to the API.

This is only the first part of this change. It is most of the functions
which are implemented in C for all NetBSD ports. Subsequent changes are
to add the same support to the remaining C files, to assembly files, and
to the automagically generated assembly source used for system calls.
When all of the above is done, ports with weak alias support should add
a definition for __weak_alias to <sys/cdefs.h>.

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Fix RCSID's

fix up some RCS Id's i botched.

merge with 4.4-Lite, keeping local changes. clean up Ids

Renamed _sigintr to __sigintr. _sigintr is in the user's namespace.

Declare rcsid strings so they are stored in text segment.

Add even more RCS frobs.

According to Ansi C, signal is supposed to return SIG_ERR on error,
not BADSIG. I know they are the same thing, but this allows me to
remove the otherwised unused, bogus macro BADSIG from signal.h

initial import of 386bsd-0.1 sources